纯js实现文件下载并重命名功能

Posted 2022-10-07 daysme

纯js实现文件下载并重命名功能

来源: https://www.cnblogs.com/vipzhou/p/10700130.html

/**
 * 获取 blob
 * @param  String url 目标文件地址
 * @return cb 
 */
function getBlob(url,cb) 
        var xhr = new XMLHttpRequest();
        xhr.open(‘GET‘, url, true);
        xhr.responseType = ‘blob‘;
        xhr.onload = function() 
                if (xhr.status === 200) 
                    cb(xhr.response);
                
        ;
        xhr.send();


/**
 * 保存
 * @param  Blob blob     
 * @param  String filename 想要保存的文件名称
 */
function saveAs(blob, filename) 
    if (window.navigator.msSaveOrOpenBlob) 
            navigator.msSaveBlob(blob, filename);
     else 
            var link = document.createElement(‘a‘);
            var body = document.querySelector(‘body‘);

            link.href = window.URL.createObjectURL(blob);
            link.download = filename;

            // fix Firefox
            link.style.display = ‘none‘;
            body.appendChild(link);

            link.click();
            body.removeChild(link);

            window.URL.revokeObjectURL(link.href);
    ;


/**
 * 下载
 * @param  String url 目标文件地址
 * @param  String filename 想要保存的文件名称
 */
function download(url, filename) 
    getBlob(url, function(blob) 
        saveAs(blob, filename);
    );
;

download(‘https://www.baidu.com/img/[e-mail]‘, ‘ab.png‘)

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